noun, takes genitive case の

Messages.yoji.
  1. unheard-of, unprecedented, unparalleled in history (unparallelled), record-breaking.

Variations

Pronunciation Kanji Kana Is Common
前代未聞 ぜんだいみもん

Contained Kanji Breakdown

in front, before
まえ ゼン さき (2nd, N5)
grass, straw, herbs
to divide
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
cutting off feet as form of punishment
ゲツ グチ ゴツ
month, moon
つき ゲツ ガツ (1st, N5)
knife, standing sword radical (no. 18)
トウ
substitute, change, convert
ダイ か.わる よ (3rd, N4)
human radical (no. 9)
piling, ceremony radical (no. 56)
ヨク いぐるみ (Kentei 1)
un-, not yet, hitherto
ミ いま.だ ビ (4th, N3)
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
tree, wood
き モク こ- (1st, N5)
hear, ask, listen
き.く ブン モン (2nd, N5)
gate, counter for cannons
モン かど と (2nd, N2)
ear
みみ ジ がみ (1st, N3)